---
product_id: 368440065
title: "Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart"
brand: "flex paste"
price: "R254"
currency: ZAR
in_stock: false
reviews_count: 5
url: https://www.desertcart.co.za/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks
store_origin: ZA
region: South Africa
---

# Fully Paintable Finish Dries & Works Underwater Waterproof & UV Resistant Seal Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart

**Brand:** flex paste
**Price:** R254
**Availability:** ❌ Out of Stock

## Summary

> 🛡️ Flex Paste: Seal, Protect, and Paint Your Way to Perfection!

## Quick Answers

- **What is this?** Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart by flex paste
- **How much does it cost?** R254 with free shipping
- **Is it available?** Currently out of stock
- **Where can I buy it?** [www.desertcart.co.za](https://www.desertcart.co.za/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks)

## Best For

- flex paste enthusiasts

## Why This Product

- Trusted flex paste brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Seal Like a Pro:** Creates a flexible, rubberized barrier that blocks air, water, and moisture for lasting protection.
- • **Paint It Your Way:** Once cured, paint over it seamlessly to match any surface and prevent rust or UV damage.
- • **Versatile Fix-All:** Ideal for walls, roofs, RVs, concrete, and more—fills large gaps, cracks, and holes with ease.
- • **Freshness Locked In:** Innovative airtight container keeps the paste fresh and ready, eliminating waste and extending usability.
- • **Underwater Application:** Unique formula allows application and curing even underwater—perfect for emergency fixes.

## Overview

Flex Paste is a premium waterproof, paintable putty designed to fill and seal gaps, cracks, and holes across multiple surfaces including drywall, concrete, and EPDM. Its thick, rubberized formula works even underwater and cures into a flexible, UV-resistant barrier. Packaged in an airtight container to maintain freshness, it offers a durable, paintable finish ideal for both indoor and outdoor repairs on walls, roofs, RVs, and more.

## Description

Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart : desertcart.in: Industrial & Scientific

Review: Excelente producto, hace todo lo que promete. Solo lo puedes usar una vez, lo deje muy bien tapado como venía en el instructivo y se seco, pero cumple perfectamente su función.
Review: I was worried bjt, it worked I repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,,

## Features

- NEW! STAY FRESH CONTAINER – Blocks out air and locks in freshness to extend the sealing power of Flex Paste, with no waste
- COAT, SEAL & PROTECT - Penetrates deep to seal out air, water, and moisture. Once dry, it turns into a strong, flexible, watertight, rubberized barrier
- WORKS UNDERWATER - Can be applied underwater, and it even dries underwater
- FILLS LARGE AREAS - Super thick rubber paste clings to the surface and instantly fills large gaps, cracks, and holes
- FULLY PAINTABLE - Once fully cured, it can be painted any color. Helps prevent rust and corrosion, and it is UV resistant
- EXCELLENT FOR – filling cracks and holes, foundation and concrete repairs, sealing out rodents and pests, bath and shower, indoor and outdoor projects, roof, RV, motorhome, auto, marine, lawn and garden projects, DIY, hobbies, and more
- MADE IN THE USA

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B084TDS8S5 |
| Are batteries included? | No |
| Best Sellers Rank | #179,047 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #692 in Hardware Sealers |
| Brand | Flex Paste |
| Colour | Black |
| Customer Reviews | 3.7 3.7 out of 5 stars (3,089) |
| Date First Available | 17 July 2020 |
| Generic Name | Flex Paste 1 lb Jar (Black) |
| Included Components | Household Item |
| Item Dimensions LxWxH | 10.8 x 10.8 x 6.4 Centimeters |
| Item Form | Paste |
| Item Height | 2.5 Inches |
| Item Weight | 454 g |
| Item Width | 4.25 Inches |
| Item dimensions L x W x H | 10.8 x 10.8 x 6.4 Centimeters |
| Item model number | FLEX SEAL - PFSBLKR16 - BLACK |
| Manufacturer | Swift Response, LLC |
| Material | Resin |
| Model number | FLEX SEAL - PFSBLKR16 - BLACK |
| Net Quantity | 473.18 Milliliters |
| Number of Items | 1 |
| Product Dimensions | 10.8 x 10.8 x 6.35 cm; 453.59 g |
| Special Feature | Waterproof |
| Style | Compact |
| Surface Recommendation | Windows,Doors |
| UPC | 850010226804 |
| Water Resistance Level | Waterproof |

## Product Details

- **Brand:** Flex Paste
- **Item Weight:** 1 Pounds
- **Item dimensions L x W x H:** 10.8 x 10.8 x 6.4 Centimeters
- **Material:** Resin
- **Style:** Compact

## Images

![Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart - Image 1](https://m.media-amazon.com/images/I/417ZtWKBwEL.jpg)
![Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart - Image 2](https://m.media-amazon.com/images/I/41EeLsdSXZL.jpg)
![Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart - Image 3](https://m.media-amazon.com/images/I/41KAAt-B2eL.jpg)
![Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart - Image 4](https://m.media-amazon.com/images/I/41T7Ya4KsXL.jpg)
![Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart - Image 5](https://m.media-amazon.com/images/I/41ZOYCG-NLL.jpg)

## Questions & Answers

**Q: Can this be used on flexible surfaces?**
A: Depends on how flexible. It has to be able to adhere to the surface. It cures the same as rubber in a tire. There is some give.

**Q: Seal wet surface**
A: Hello there. That's an excellent question. Flex Paste can be applied to dry or wet surfaces and even underwater. It does not dissolve, creating a watertight seal. Thank you very much for reaching out to us with your question. Please write to us anytime. We're always happy to help. Flex On!

**Q: Flex seal pasta can it be used on curved surfaces?**
A: Yes it can be used on any curved and even upside down surface but if ordering on-line, if you open the can and the edges are turning hard return it ASAP because chances is it's hard on bottom as-well and you don't get your money worth

**Q: Can I use in a in ground swimming pool to repair a crack**
A: Yes, it can be applied underwater. It won’t dissolve or wash away. It even dries underwater! Flex Paste is easy to use. With a putty knife, trowel, spatula, roller, or stiff brush remove a smooth even layer of material from the top of the tub. Scooping deeply into the tub may cause air pockets which can dry FLEX PASTE.  Apply a generous amount using a smooth sweeping motion.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by G***S on 4 November 2022*

Excelente producto, hace todo lo que promete. Solo lo puedes usar una vez, lo deje muy bien tapado como venía en el instructivo y se seco, pero cumple perfectamente su función.

### ⭐⭐⭐⭐⭐ Review
*by L***K on 18 April 2025*

I was worried bjt, it worked I repaired a fiberglass bathtub, it was thick, I globed it on and to worked good, my can was air tight and fresh, not permanent but long lasting patch, don't get it on your clothes,,,

### ⭐⭐⭐ Review
*by 関***雄 on 14 May 2025*

トップライトの雨漏りに、ガラス周りをこのペーストでシーリングしました。効果は高いけど購入の半分は固まりで使えない

## Frequently Bought Together

- Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Half-Quart
- Flex Paste, Waterproof Paintable Putty, Spackle Sealant, Fill Gaps Cracks Holes - Block Out Water and Air - UV Resistant - Walls, Drywall, EPDM, Concrete, Roof, RV Repairs, Black, Cartridge
- Flex Seal 2-Pack Black 17oz Stop Leaks Instantly, Waterproof Sealant Coating For Gutters, RV, Roof, Skylights, Windows

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**Shop now:** [https://www.desertcart.co.za/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks](https://www.desertcart.co.za/products/368440065-flex-paste-waterproof-paintable-putty-spackle-sealant-fill-gaps-cracks)

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*Product available on Desertcart South Africa*
*Store origin: ZA*
*Last updated: 2026-03-21*